JP2001280404A - Liquid enclosed vibration absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid enclosed vibration absorber which is applied easily for complex car loading styles, their dimensions and also is assembled easily and gets necessary strength and is improved in durability and reliability. SOLUTION: The rubber vibration absorber body 3 is equipped between the holding cylinder 11 of the lower fitting metal 1 and the upper fitting metal 2. The ring 30 is stuck at the outer surface of lower portion of absorber body 3. The diaphragm 5 is equipped on the bottom of the middle cylinder 4. The partition 6 is equipped on the inner surface of cylinder 4. The top of cylinder 4 is inserted into the lower portion of cylinder 32. The outer edge in top side of middle cylinder 4 is calked and fixed on the flange portion 31 of the ring. The chamber between the partition 6 and the absorber body 3 is liquid chamber 7a and the chamber 7b is between the partition 6 and diaphragm 5. The orifice 8 is connected between the chamber 7a and 7b. The middle cylinder 4 is pressed into the holding cylinder 11. The stopper 9 is equipped over the upper fitting metal 2 and is calked and fixed on the top edge of cylinder 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled type vibration damping device which is mainly used to support a power unit such as an automobile engine and other vibration generators in a vibration-damping manner.

[0002]

2. Description of the Related Art As a vibration isolator for supporting a vibrating body such as an automobile engine so as not to transmit the vibration to a vehicle body or the like, a main body having a vibration isolating base made of a rubber elastic body. A partition member and a diaphragm are arranged in the inside, and these are partitioned into upper and lower two chambers forming a part of the chamber wall to provide a liquid chamber in which a liquid is sealed, and both liquid chambers are communicated by orifices on the outer periphery of the partition member. A liquid-filled type vibration damping device configured to perform a vibration damping function and a vibration insulating function by a liquid flow effect of both chambers by a orifice and a vibration damping effect of a vibration damping base is known, and various proposals have been made. It has been done.

For example, Japanese Patent Application Laid-Open No. 10-38015 discloses that a diaphragm is provided at a lower end portion inside a bottomed cylindrical main body fitting as a lower mounting fitting connected to a lower portion of a vibration isolating base. A liquid in which a partition member is fitted on the inner periphery, and an intermediate tube having an orifice formed on the outer periphery is further fitted into a bottomed cylindrical main body fitting, and two liquid chambers and an air chamber are provided therein. An enclosed type vibration damping device has been proposed.

[0004] In this proposed vibration isolator, the upper mounting bracket mounted on the vibrating body side projects upward from the vibration isolating base, and the bracket on the vibrating body side is connected and fixed on the upper mounting bracket. ing. For this reason, the bracket extending from the vibrating body becomes large, and the mounting structure is restricted, resulting in a reduction in weight and mounting property.

Further, since a stopper fitting for restricting large displacement of the upper fitting is fixed to the upper end of the main body fitting and has a cylindrical shape surrounding the vibration isolating base and the upper fitting,
As described above, the bracket must be fixed to the upper mounting bracket at the upper portion, and the upper mounting bracket larger than the stopper metal cannot be provided.

Further, there has been proposed a vibration damping device in which the upper mounting bracket has a mounting hole in a direction perpendicular to the axis of the device and can be bolted laterally to a bracket on the vibrating body side (for example, Japanese Patent Application Laid-Open No. HEI 9-110572). 10-47416).

In this vibration isolator, the bracket can be compacted because it can be bolted laterally to the bracket on the side of the vibration generator, but a stopper for restricting large displacement of the upper mounting member in the vertical and front-rear directions. The member is fixed by bolts and nuts to the supporting portion that protrudes from the lower end of the lower mounting bracket to the front and rear sides, and it takes time and effort to mount, and also has poor compatibility with the mounting shape It is.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and can easily cope with complicated vehicle mounting forms and dimensions with a small number of components, and is easy to assemble and can secure required strength. It is intended to provide a liquid filling type vibration damping device having high reliability and high reliability.

[0009]

The liquid filling type vibration damping device according to the present invention has a holding tube of a lower mounting bracket having a holding tube opening vertically and an axis perpendicular to the axis of the device. A vibration-damping base made of a rubber elastic body is interposed between the thick-walled cylindrical upper mounting bracket, and a diaphragm made of a rubber film opposed to the vibration-damping base inside the holding cylinder; A liquid filling type vibration damping device comprising a partition member for partitioning the diaphragm into two chambers and providing two liquid chambers communicating with each other through an orifice. An annular member having a cylindrical shape and a lower portion is fixed, and an intermediate cylinder is provided which is coupled to the annular member.The diaphragm is attached to the lower end of the intermediate cylinder, and a partition member is provided on the inner periphery. The upper portion of the intermediate cylinder is fitted with the annular portion. And the upper end outer edge of the intermediate cylinder is caulked and fixed to the flange-like upper part of the annular member, and a space between the partition member and the vibration-isolating base and the diaphragm is formed as a liquid chamber. The two liquid chambers are communicated with each other by an orifice of a partition member, and the intermediate cylinder is press-fitted into the holding cylinder.

According to the liquid filled vibration isolator of the present invention, at the time of its assembly, the upper part of the intermediate cylinder having the diaphragm and the partition member is fitted to the outer peripheral part of the lower part of the vibration isolating base in the liquid layer. Along with fitting to the cylindrical lower part of the annular member having
The upper end outer edge of the intermediate cylinder is caulked and fixed to the flange-like upper part of the annular member, thereby temporarily assembling the liquid therein, and thereafter, in air, the lower part of the intermediate cylinder is mounted. It can be assembled by press-fitting from the upper part into the holding cylinder of the fitting. Thereby, it can be easily assembled. In particular, since the intermediate cylinder also serves as a fixing portion for coupling to the supporting portion of the diaphragm, the outer peripheral wall of the liquid chamber, and the annular member on the vibration isolating base side, the configuration can be simplified and the number of components can be reduced.

In the above-described liquid-filled type vibration damping device, a bridge-like stopper member for restricting a large displacement of the upper mounting member over the upper mounting bracket fixed to the upper portion of the vibration isolating base. And both ends of the stopper member are caulked and fixed to a part of an upper end edge of a holding cylinder of the lower mounting bracket. This allows
The stopper member can also be easily fixed, a sufficient coupling strength can be ensured, and the stopper action for suppressing large displacement can be reliably performed.

In the above-mentioned liquid-filled type vibration damping device, it is preferable that a stopper rubber integral with the vibration damping base is provided at a position corresponding to the stopper member on the upper and side surfaces of the upper mounting member. That is, when the upper mounting member abuts against the stopper member, the upper mounting member can be elastically abutted via the rubber for the stopper, so that it is possible to prevent a hitting sound due to the abutment and to generate no noise.

[0013] In the above-mentioned liquid filled type vibration damping device,
A stopper portion that can be brought into contact with the upper mounting bracket when it is largely displaced downward is extended on a part of the flange-shaped upper portion of the annular member, and an upper end outer edge of the intermediate cylinder except for the stopper portion is formed of the annular member. It can be formed by being caulked and fixed to the flange-shaped upper part. Thereby, the intermediate cylinder can be caulked and fixed regardless of the presence of the stopper portion of the annular member.

In the above liquid filled type vibration damping device, an inner flange portion is provided at a lower end portion of the intermediate cylinder so as to protrude inward, and the diaphragm is attached to an inner periphery of the inner flange portion. A seal rubber layer integral with the diaphragm is attached to the inner periphery of the diaphragm, and the partition member is liquid-tightly fitted to a position in contact with the inner flange portion via the seal rubber layer. This allows
The two liquid chambers can be easily and accurately configured inside the intermediate cylinder, and the diaphragm cover can be dispensed with.

Further, in the above-mentioned liquid-filled type vibration damping device, the partition member is made of synthetic resin or aluminum,
It is preferable that the partition member be made of a molded body such as ceramic and have an orifice passage formed in the outer peripheral portion of the partition member.
Thus, the partition member can be easily manufactured, and the orifice that connects the two liquid chambers can be easily configured.

The partition member is provided with a plurality of through-holes at a center plate portion thereof shifted from an axis, and a rubber movable member capable of closing the through-hole by contacting the surface of the center plate portion during large amplitude vibration. Those provided with a valve are preferred. This makes it possible to obtain a high damping at the time of large amplitude vibration and a low dynamic spring constant at the time of small amplitude vibration. In addition, a space for forming the entrance of the orifice can be secured without any problem.

The movable valve comprises a pair of rubber plates that are connected through the center plate so as to face the upper and lower surfaces of the center plate of the partition member with a slight gap therebetween. Is preferable, and its mounting configuration and production are facilitated.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described based on embodiments shown in the drawings.

FIG. 1 is a longitudinal sectional view of a liquid filling type vibration damping device according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view taken along the line XX in FIG. 3, and FIG. 4 shows the same plan view, and FIG. 5 shows the same side view.

(1) A lower mounting bracket having a holding cylinder (11) at the center thereof which opens vertically, and (2) a thick cylindrical upper mounting bracket having an axis perpendicular to the apparatus axis. , (3)
Is a thick anti-vibration base made of a rubber elastic body interposed between the lower mounting bracket (1) and the upper mounting bracket (2).

The lower mounting bracket (1) is integrally formed by drawing with a metal material such as a steel plate, and the holding cylinder (11) is formed.
The main body is attached to a frame or a bracket (not shown) on the vehicle body side by bolting means by supporting portions (12) (12) projecting to both sides from the lower end of the vehicle. (13) indicates a bolt fastening hole. The support portions (12) and (12)
Both side edges are bent upward to form a substantially concave cross section.

The upper mounting bracket (2) has both ends protruding from the vibration isolating base (3), and is mainly provided inside a power unit such as an automobile engine, that is, a bracket (not shown) on the vibrating body side. It is attached by bolt fastening means inserted into the hole. The one end protruding portion (21) of the upper mounting member (2) which is protruded long is formed in a square shape for a stopper function described later, and the lower surface thereof is formed as a stopper surface.

As shown in the drawing, the vibration-isolating substrate (3) has a curved lower surface side, and the upper mounting bracket (2) is fixed to the upper portion thereof by vulcanizing and bonding means with its axial center oriented sideways. Have been. In the case shown in the figure, it is held in a state of being buried by a stopper rubber integrated with a vibration-proof base described later. In addition, an annular member (30) as a reinforcing metal fitting having a flange-like upper part projecting outward and a cylindrical lower part is vulcanized and bonded to the outer periphery of the lower part of the vibration-proof base (3).

(31) is a flange-like upper part of the annular member (30), (32) is a cylindrical lower part, and a flange-like upper part (31) is shown.
Is integrally provided with a stopper portion (33) projecting outward at a position corresponding to the one-end-side projecting portion (21) of the upper mounting bracket (2). At the time of a large downward displacement of 2), the angular projection (2
It is provided so that the lower surface (stopper surface) of 1) can abut. A stopper rubber (34) integral with the vibration isolating base (3) is provided on the upper surface of the stopper portion (33) so that the projecting portion (21) elastically contacts and does not generate a tapping sound. Has become.

(4) is an intermediate cylinder which can be press-fitted into the holding cylinder (11) of the lower mounting bracket (1), and constitutes an outer peripheral wall of the liquid seal main body. The intermediate cylinder (4) has a vertically open tubular shape, and a diaphragm (5) made of a rubber film opposed to the vibration-proof base (3) so that the lower end is closed at the lower end.
And a partition member (6) for partitioning between the vibration-proof base (3) and the diaphragm (5).
In the case shown in the figure, the intermediate cylinder (4) is provided at its lower end with an inner flange portion (41) having a substantially hook-shaped cross section which is bent and extended inward, and the inner flange portion (41) is provided. The diaphragm (5) is attached to the inner periphery of the intermediate cylinder (4) by vulcanization bonding means, and a seal rubber layer (42) integral with the diaphragm (5) is attached to the inner periphery of the intermediate cylinder (4).
The partition member (6) is fitted in a liquid-tight manner at a position in contact with the inner flange portion (41) via the seal rubber layer (42).

The upper part of the intermediate cylinder (4) is liquid-tightly fitted to the cylindrical lower part (32) of the annular member (30) until it comes into contact with the flange-shaped upper part (31). ) And the vibration-proof substrate (3), and between the partition member (6) and the diaphragm (5) are each partitioned into two chambers by the partition member (6), and a liquid chamber ( 7a) and (7b) are formed as the two liquid chambers (7a) and (7b).
Are communicated by an orifice (8) provided in the partition member (6).

The upper end of the intermediate tube (4) has a flange shape larger in diameter than the flange-shaped upper portion (31) of the annular member (30), and its edge (44) has a flange-shaped upper portion (31). Is folded over substantially the entire circumference except for the stopper portion (33) and is caulked and fixed. Therefore, the intermediate cylinder (4)
Serves also as a supporting portion of the diaphragm (5), outer peripheral walls of the liquid chambers (7a) and (7b), and a portion fixed to the annular member (30) on the vibration-isolating base (3) side.

The partition member (6) is made of a molded body made of a synthetic resin having a required strength and rigidity, a metal material such as aluminum, or a rigid material such as ceramic, and is provided around the outer periphery of the partition member (6). A circumferential groove (81) is formed as an orifice (8) extending in the direction. In the case of the drawing, a circumferential groove (81) is formed over substantially two rounds which are communicated at one place. Not limited to this, the circumferential length of the circumferential groove (81) and the cross-sectional area in the direction orthogonal to the length direction can be appropriately set according to the vibration isolation characteristics. can do. (8a) and (8b) are both liquid chambers (7a)
This is the entrance of the orifice (8) opening to (7b).

In the center plate (61) of the partition member (6), a plurality of through-holes (62) are provided so as to shift the axis of the apparatus, and when a large amplitude vibration occurs (when the liquid chamber is at a high pressure). The upper and lower surfaces of the partition member (6) are in contact with each other and the through holes (62)
There is provided a rubber movable valve (63) capable of closing the valve. As shown in the figure, the movable valve (63) is connected to the upper and lower surfaces of the partition member (6) by penetrating through the central plate portion (61) so as to be opposed to each other with a very small gap. It consists of a pair of rubber plates (63a) (63b). In the case of the figure, both rubber plates (63a)
(63b) a mushroom-shaped engaging projection (64a),
It is connected to the other engaging hole (64b) by a fitting means. Thereby, the movable valve (63) can be easily mounted. Also, by adjusting the gap between the rubber plates (63a) (63b) and the central plate portion (61), the vibration isolation characteristics can be adjusted. For example, high damping can be achieved during large amplitude vibration of 0.5 mm or more. A low dynamic spring constant can be achieved at the time of small amplitude vibration of 0.1 mm or less. The rubber movable valve (63) is provided so that the axial position thereof is shifted with respect to the axial center of the partition member (6), and thereby the space for providing the entrances (8a) and (8b) of the orifice (8). Is secured.

Then, in a state where the intermediate cylinder (4) is connected to the vibration isolating base (3) as described above, the intermediate cylinder (4)
Is press-fitted into the holding cylinder (11) of the lower mounting bracket (1) from above, and in particular, the projecting direction of the upper mounting bracket (2) is such that the support portions (12) (12) of the lower mounting bracket (1) Are press-fitted so as to intersect with the direction in which they project.

Further, above the upper mounting bracket (2) fixed to the upper part of the vibration-isolating base (3), the upper mounting bracket (2) is straddled over the upper mounting bracket (2) and on both front and rear sides. A stopper member (9) in the form of an inverted concave bridge for restricting large displacement of the lower mounting bracket (1) is provided, and both ends (91) and (91) of the stopper member (9) extend downward. ) Is fixed by caulking to a part of the upper edge of the holding cylinder (11),
The upper mounting member (2) is configured to abut on this to perform a stopper function. (14) shows the caulking fixing portion.

A stopper rubber (35) integral with the vibration isolating base (3) is provided at a position corresponding to the stopper member (9) on the upper and side surfaces of the upper mounting bracket (2). The mounting bracket (2) elastically abuts against the stopper member (9) via the rubber for stopper (35), so that it is possible to prevent occurrence of a tapping sound due to the abutment.

In the case of the embodiment shown, the stopper member (9) is bent at both side edges to form a substantially concave cross section, thereby maintaining a predetermined strength.

The liquid-filled type vibration damping device having the above structure is assembled and constructed as follows.

First, a pair of rubber plates (63a) (63b) constituting the movable valve (63) is temporarily assembled in advance to the partition member (6). Then, a partition member (6) forming an orifice (8) is fitted to the inner periphery of the intermediate cylinder (4) provided with the diaphragm (5) in the liquid tank, and the upper part of the intermediate cylinder (4) is fixed. Is fitted to the cylindrical lower part (32) of the annular member (30) fixed to the outer periphery of the lower part of the vibration isolating base (3), and the outer edge of the upper end of the intermediate cylinder (4) is attached to the annular member (30). ) Is temporarily assembled with the liquid enclosed therein by caulking and fixing the upper part (31). Thereafter, in the air, the intermediate cylinder (4) is supported on the lower mounting bracket (1) by the projecting direction of the upper mounting bracket (2) relative to the holding cylinder (11) of the lower mounting bracket (1). (12) Position it so that it is perpendicular to the projecting direction of (12), and press-fit from above. Next, a bridge-like stopper member (9) is placed over the upper mounting bracket (2) so as to straddle the upper mounting bracket (2), and both ends (91) and (91) are attached to the upper edge of the holding cylinder (11). Assemble by caulking and fixing to a part of.

At this time, it is possible to easily assemble and configure without requiring alignment in the liquid tank, and to secure sufficient liquid sealing and bonding strength. Further, since the intermediate cylinder (4) also serves as a supporting portion of the diaphragm (5) and a fixing portion to the outer peripheral wall of the liquid sealing main body and the vibration isolating base, the configuration can be simplified and the cost can be reduced.

In the liquid filled vibration isolator assembled as described above, the support portions (12) and (12) of the lower mounting bracket (1) are fixed to a frame or a bracket on the vehicle body side, and the upper mounting bracket is mounted. (2) is used by being fixed to a bracket on the vibrating body side such as a power unit by bolt fastening means and connected in a cantilever state. Then, when the vibration isolating base (3) is elastically deformed by the vibration given by the vibrating body, the liquid in both the liquid chambers (7a) and (7b) flows out and in through the orifice (8), and the orifice (8) ), And a vibration damping effect can be obtained by the vibration damping effect of the vibration isolating substrate (3).

[0038]

As described above, according to the liquid-filled type vibration damping device of the present invention, it is possible to easily cope with complicated vehicle mounting forms and dimensions with a small number of components, and it is easy to assemble and has the necessary strength. Thus, it is possible to obtain a liquid-filled type vibration damping device having high durability and high reliability.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a liquid-filled type vibration damping device according to one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view taken along line XX of the preceding figure.

FIG. 3 is a front view of the vibration isolator according to the first embodiment.

FIG. 4 is a plan view of the vibration isolator according to the first embodiment.

FIG. 5 is a side view of the vibration isolator of the above.

FIG. 6 is a half cross-sectional perspective view showing a partition member separated.

[Explanation of symbols]

 (1) Upper mounting bracket (11) Holding cylinder (12) (12) Support part (13) Hole for bolt fastening (14) Caulking fixed part (2) Upper mounting bracket (21) One end side protruding part (3) Prevention Vibration base (30) Annular member (31) Upper flange (32) Lower cylinder (33) Stopper (34) Rubber for stopper (4) Intermediate cylinder (41) Inner flange (42) Seal rubber layer (44) End Edge (5) Diaphragm (6) Partition member (61) Center plate (62) Through hole (63) Movable rubber valve (63a) (63b) Rubber plate (64a) Engagement protrusion (64b) Engagement hole (7a) (7b) Liquid chamber (8) Orifice (8a) (8b) Doorway (81) Circumferential groove (9) Stopper member (91) (91) Both ends

Claims (8)

[Claims] A rubber elastic member is provided between the holding cylinder of the lower mounting bracket having a holding cylinder which opens vertically and a thick cylindrical upper mounting bracket having an axis perpendicular to the axis of the apparatus. With a vibration isolating base made of a body interposed, inside the holding cylinder,
A liquid-sealing type diaphragm comprising a diaphragm made of a rubber film opposed to a vibration-isolating base, and a partition member for dividing the vibration-isolating base and the diaphragm into two chambers, and providing two liquid chambers communicated by orifices. A vibration device, wherein an annular member having a flanged upper portion and a lower cylindrical portion is fixed to an outer peripheral portion of a lower portion of the vibration isolation base, and further includes an intermediate cylinder coupled to the annular member. The diaphragm is attached to the lower end, a partition member is fitted to the inner periphery, the upper part of the intermediate cylinder is fitted to the cylindrical lower part of the annular member, and the outer edge of the upper end of the intermediate cylinder is the annular member. The partition member and the vibration-isolating base and the diaphragm are respectively formed as liquid chambers, and both liquid chambers are communicated by orifices of the partition member. A liquid filling type vibration isolator, wherein the intermediate cylinder is further press-fitted into the holding cylinder. 2. A bridge-like stopper member for restricting a large displacement of the upper mounting member is provided above the upper mounting member fixed to the upper portion of the vibration isolating base so as to straddle the upper mounting member. 2. The liquid filled vibration isolator according to claim 1, wherein both end portions are caulked and fixed to a part of an upper end edge of a holding cylinder of the lower mounting bracket. 3. The liquid-filled vibration damping device according to claim 2, wherein a stopper rubber integral with the vibration damping base is provided at a position corresponding to the stopper member on the upper and side surfaces of the upper mounting member. 4. A part of a flange-like upper part of said annular member,
2. A stopper portion which can be brought into contact with the upper mounting member when it is largely displaced downward is extended, and an outer edge of an upper end of the intermediate cylinder is fixed by caulking to a flange-like upper portion of the annular member except for the stopper portion. A liquid-filled vibration damping device according to item 1. 5. An inner flange portion is provided at a lower end portion of the intermediate cylinder so as to protrude inward. The diaphragm is attached to an inner periphery of the inner flange portion, and is integrated with the diaphragm on an inner periphery of the intermediate cylinder. 2. The liquid filling type vibration damping device according to claim 1, wherein a sealing rubber layer is provided, and the partition member is liquid-tightly fitted at a position in contact with the inner flange portion via the sealing rubber layer. 6. The partition member is made of a molded article of synthetic resin, aluminum, ceramic, or the like, and an orifice passage is formed in an outer peripheral portion of the partition member.
6. The liquid-filled type vibration damping device according to any one of 5. 7. A movable rubber member which is provided with a plurality of through holes in the center plate portion of the partition member, which are offset from the axis, and which closes the through holes in contact with the surface of the center plate portion during large amplitude vibration. 7. The liquid filled type vibration damping device according to claim 6, further comprising a valve. 8. A pair of rubber plates penetrating through the central plate portion so that the movable valve faces the upper and lower surfaces of the central plate portion of the partition member with a small gap therebetween. The liquid-filled type vibration damping device according to claim 7.